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Brazil’s battery storage sector more confident on growth
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Brazil battery storage companies and their trade group, ABSAE, say the market has clearer pathways to scale after the federal government signalled periodic capacity-reserve auctions that will allow storage to compete. ABSAE’s executive director Fabio Lima told BNamericas that predictable auction timing should cut preparation costs and give investors more confidence. Two numbers anchor the case: ABSAE estimates at least 4.5 GW of additional capacity will be needed in 2028, and the National System Operator (ONS) has identified an approximate 56 GW connection margin in the National Interconnected System (SIN). Those supply and grid signals are the immediate drivers behind the sector’s increased confidence.
Having the perspective that the auctions will be periodic, even if we do not necessarily know the volume, gives an indication of some longevity for the industry that is coming to set up,
Fabio Lima, executive director, ABSAE
Key takeaways
- ABSAE demand estimate: ABSAE estimates the Brazilian power system will need at least 4.5 GW of additional capacity in 2028, as first reported by BNamericas.
- Auction contracting and investment: For this year's tender, ABSAE anticipates contracting between 2 GW and 5 GW, with related investments totalling up to 20 billion reais (around US$5 billion).
- Grid connection headroom: The ONS technical note identified around 56 GW of connection margin in the SIN for new storage systems.
- Consumer savings potential: ABSAE estimates contracting 4.5 GW of BESS could save consumers between 5.5 billion and 8.3 billion reais per year and cut curtailment costs by up to 550 million reais annually.
Table of contents
- Key takeaways
- How auctions are shaping demand and investor certainty
- Grid space is large on paper — and regionally concentrated
- Where batteries beat thermal plants on short-duration peaks
- Other applications broaden the market beyond auctions
- Why the case for growth is credible — and where it could stall
- What to be careful about
- Frequently asked questions
How auctions are shaping demand and investor certainty
ABSAE sees the prospect of periodic capacity-reserve auctions as a structural change that lowers commercial risk for battery projects. Fabio Lima said knowing auctions will recur, even if the volume is not fixed, gives the industry a signal of longevity and helps justify local manufacturing investment.
For the immediate pipeline the association maintains a contracting range of 2 to 5 GW in this year’s tender, a span that frames developer and supplier planning. ABSAE also links storage demand to broader drivers — economic growth and electrification that raise peak-hour needs — and points to one-to-four-hour-duration systems as the formats most likely to compete in capacity auctions.
Grid space is large on paper — and regionally concentrated
An ONS technical note put the aggregate connection margin across the National Interconnected System at about 56 GW; ABSAE says that is many times larger than its mid-range deficit projections for 2028–2030. At substations receiving support from the Ministry of Mines and Energy, the combined margin is roughly 13.7 GW, a second indicator that also surpasses ABSAE’s most severe deficit scenario.
That headroom is not evenly distributed. Of 129 subsidized dams, 93 have recognized margins, with the highest concentrations in the Northeast — notably Bahia, Piauí and Ceará — and in the north of Minas Gerais. ABSAE argues the geographic spread reduces the risk of a single grid bottleneck.
Where batteries beat thermal plants on short-duration peaks
ABSAE and its consultant underscore that batteries are better aligned with short, high-value demand periods than many thermal units. A study by Volt Robotics for ABSAE finds that by 2030 only 6% of the thermoelectric capacity analysed will be limited to dispatch durations under four hours, while 45% will be capable of runs exceeding 12 hours. That implies a substantial share of the thermal fleet is configured for extended operation rather than brief peak support.
ABSAE quantifies the system benefits: contracting 4.5 GW of BESS could yield between 5.5 billion and 8.3 billion reais a year in consumer savings, plus as much as 550 million reais a year from reduced curtailment for generators. The association says these system-level savings should guide how auctions and funding share benefits among consumers, generators and investors.
Other applications broaden the market beyond auctions
ABSAE highlights additional revenue and value streams that reduce the market’s reliance on capacity-reserve auctions. Storage is being proposed inside transmission projects to provide system security and electrical control functions rather than bulk supply. ABSAE mentioned a transmission-linked storage project planned for the Cruzeiro do Sul region in Acre where the priority is resilience and grid operation.
Separately, storage hybridised with solar in isolated systems is replacing diesel-run thermal plants on islands and in Amazon communities. ABSAE cited projects in the Amazon and on Fernando de Noronha as examples where batteries cut fuel use and improve reliability. Those alternative applications, the association says, point to a diversified market that can grow even if auction volumes fluctuate.
| Item | Figure | Context |
|---|---|---|
| ONS connection margin (SIN) | around 56 GW | Headroom for new storage across the National Interconnected System |
| Subsidized substations aggregate margin | approximately 13.7 GW | Ministry of Mines and Energy-subsidized substations |
| ABSAE 2028 additional capacity need | at least 4.5 GW | Association’s conservative scenario for 2028 |
| This year’s tender contracting estimate | 2 to 5 GW | ABSAE’s range for the current auction; final decision rests with the granting authority |
Why the case for growth is credible — and where it could stall
The case for
- Predictable, periodic capacity-reserve auctions should lower pre-qualification and preparation costs and help attract local manufacturing investment, as Fabio Lima said.
- The ONS-identified 56 GW connection margin and 13.7 GW at subsidized substations provide substantial theoretical headroom for new BESS capacity across multiple regions.
- Multiple use-cases — capacity, transmission security and isolated-system hybridisation — diversify revenue streams beyond a single market mechanism.
The case against
- Auction timing may be regular but volumes are unspecified; ABSAE itself notes the periodic schedule does not guarantee a specific contracted MW figure.
- Regional concentration of recognized margins (Northeast and north of Minas Gerais) could create localized competition for interconnection capacity and favourable sites.
- A large share of the thermal fleet remains geared to long dispatch windows (45% >12 hours in a Volt Robotics sample), which can complicate stacking of short-duration services and market rules.
What to be careful about
- Uncertainty over auction volumes: periodic scheduling does not fix the MW to be procured and the final contracting rests with the granting authority.
- Local grid constraints despite national headroom: regional concentrations of margin mean some load centres may still face access difficulties.
- Distribution of benefits: ABSAE stresses savings accrue system-wide, so auction and funding design that fails to allocate those gains could undermine project bankability.
- Dependence on policy and fiscal incentives: competitiveness in some regions hinges on proximity to load centres and possible tax incentives mentioned by ABSAE.
The bottom line
Brazil’s storage sector has a concrete case for growth built on three linked facts: a policy shift toward periodic capacity auctions, sizeable theoretical grid connection margins reported by ONS, and system benefits quantified by ABSAE and its consultant that show consumer savings and reduced curtailment. Those signals reduce some commercial uncertainty and broaden viable business models to include transmission services and isolated-system hybrids. Remaining questions about auction volumes, precise calendar dates and how benefits will be shared mean the next steps are procedural and contractual rather than technical; resolving them will determine how quickly the theoretical headroom turns into deployed gigawatts.
What to watch
- Watch for Brazil’s first battery contract in a transmission auction in 2027.
- Watch for the granting authority’s final decision on this year’s tender; no date has been set.
- Watch for publication of the capacity-reserve auction calendar; no date has been set.
Frequently asked questions
How much additional capacity does ABSAE say Brazil will need by 2028?
ABSAE projects a minimum new-capacity requirement of 4.5 GW for 2028.
How much grid connection headroom exists for new storage projects?
An ONS technical note identified around 56 GW of connection margin in the National Interconnected System (SIN), and about 13.7 GW across MME-subsidized substations.
Why are batteries favoured over thermal plants for peak support?
A Volt Robotics study for ABSAE found only 6% of analysed thermoelectric capacity will have dispatch times under four hours in 2030, while 45% will be capable of dispatches longer than 12 hours; batteries better match short-duration peak needs.
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